Resistance of Coated and Uncoated IR Windows to Seawater Corrosion. Phase V. Summary
1981
Stachiw, J D | Bertic, S L
Specimens of germanium, chalcogenide glass, and zinc selenide were submerged in seawater for testing periods up to 4 months and the deterioration of their surface was noted. Some of the specimens tested were coated with single- or multiple-layer antireflection (AR) coatings, while others had protective coatings of various types or were bare. The specimens were subjected (when submerged, out of the water, or both) to several procedures designed to inhibit fouling. Chalcogenide AMTIR-1 (Ge33As12Se55) glass specimens and germanium coated with AMTIR-1 chalcogenide glass exhibited excellent corrosion resistance. The multilayer durable antireflective coating, Exotic Materials 40100, although not as corrosion-resistant as chalcogenide glass coating, exhibited the best corrosion resistance of all the AR coatings tested in the study. Antireflective, thick carbon coating applied to germanium by Honeywell, Inc, provided good corrosion resistance but still suffered from a larger amount of pinholes than the best multilayer AR coating tested. It had the advantage, however, of excellent hardness and scratch resistance which was significantly superior to any other coating tested in this study.
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